Swift 中的 UIAnimation 重复问题

Question

我的项目中有一个简单的 UIButton，按钮内有动画块运行。基本上，我有一个连接到另外两个子按钮的 mainButton。当按下 mainButton 时，我的 subButtons 将出现在带有动画的视图中。我正在使用以下代码。

@IBOutlet weak var mainButton: UIButton!
@IBOutlet weak var subButton1: UIButton!
@IBOutlet weak var subButton2: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

     subButton1.hidden = true
     subButton2.hidden = true
}

 //    override func viewDidAppear(animated: Bool) {
 //        subButton1.hidden = true
 //        subButton2.hidden = true
 //    }

@IBAction func mainButtonAction(sender: AnyObject) {

     self.subButton1.hidden = false
     self.subButton2.hidden = false

     self.subButton1.center.x += self.view.frame.width
     self.subButton2.center.x -= self.view.frame.width

     //First Piece of Animation:
     UIView.animateWithDuration(1.5, delay: 0.05,usingSpringWithDamping: 0.9,initialSpringVelocity: 0.5, options:UIViewAnimationOptions.CurveEaseIn, animations: {

     self.subButton1.center.x -= self.view.frame.width
     self.subButton2.center.x += self.view.frame.width

        }, completion: {finished in 

      //Second Piece of Animation:       
     UIView.animateWithDuration(1.5, delay: 5, options:UIViewAnimationOptions.CurveEaseOut, animations: {

     self.subButton1.center.x += self.view.frame.width 
     self.subButton2.center.x -= self.view.frame.width

     }, completion:  nil)
     })
     }

以上代码按我希望的方式工作，但仅当我第一次按下 mainButton 时才有效。但是，问题是当我再次按下 mainButton 时没有任何反应。我希望每次按下 mainButton 时都出现动画....

提前致谢。

Answer 1

您遇到了出现和消失的动画时间问题。动画的两个部分都工作正常。如果提前单击按钮，按钮的 X 位置就会出现问题。请注意，如果您对 "pieces of animation" 发表评论，您的代码可以正常工作。您可以打印 X 值并查看发生了什么。

几个选项：

在两者之间切换。

创建起点，按下按钮时：

class ViewController: UIViewController {

var intialPointXButton1: CGFloat = 0.0
var intialPointXButton2: CGFloat = 0.0
...

动画播放时禁用按钮运行:

@IBAction func mainButtonAction(sender: AnyObject) {

  self.subButton1.hidden = false
  self.subButton2.hidden = false

  self.subButton1.center.x += self.view.frame.width
  self.subButton2.center.x -= self.view.frame.width
  self.mainButton.enabled = false // Disable the main button

  //First Piece of Animation:
  UIView.animateWithDuration(1.5, delay: 0.05,usingSpringWithDamping: 0.9,initialSpringVelocity: 0.5, options:UIViewAnimationOptions.CurveEaseIn, animations: {

  self.subButton1.center.x -= self.view.frame.width
  self.subButton2.center.x += self.view.frame.width

  }, completion: {finished in

    //Second Piece of Animation:
    UIView.animateWithDuration(1.5, delay: 5, options:UIViewAnimationOptions.CurveEaseOut, animations: {

      self.subButton1.center.x += self.view.frame.width
      self.subButton2.center.x -= self.view.frame.width

      }, completion:  { finished in
        self.mainButton.enabled = true // Enable the main button
    })
  })
}

Swift 中的 UIAnimation 重复问题

UIAnimation repeating issue in Swift

uiviewanimation

swift